Question 1

What is the population of Roche-Derrien?

Accepted Answer

The commune of Roche-Derrien has 2,643 inhabitants per the INSEE census.

Question 2

Are there natural risks in Roche-Derrien?

Accepted Answer

Yes, Roche-Derrien is exposed to 10 natural risk(s): Affaissements et effondrements d'origine anthropique (anciennes carrières souterraines, hors mines), Inondation, Mouvement de terrain, Par submersion marine, Par une crue à débordement lent de cours d'eau, Phénomène lié à l'atmosphère, Radon, Séisme, Tassements différentiels, Tempête et grains (vent). Source: Géorisques / GASPAR.

Question 3

What is the energy performance of homes in Roche-Derrien?

Accepted Answer

Out of 268 ADEME EPCs available in Roche-Derrien, the most common label is D. 6% are rated A or B.

Question 4

What is the crime rate in Roche-Derrien?

Accepted Answer

In 2025, the crime rate in Roche-Derrien was 7.6 offences per 1,000 inhabitants (burglaries, theft, violence, vandalism). Source: SSMSI / French Ministry of the Interior.

Question 5

Is the tap water safe to drink in Roche-Derrien?

Accepted Answer

Tap water in Roche-Derrien is compliant with quality standards. Source: ARS / Hub'eau. (1072 analyses over 12 months)

Question 6

What is the air quality in Roche-Derrien?

Accepted Answer

According to LCSQA stations (5-year mean) in Roche-Derrien: PM2.5 : 7.4 µg/m³, NO₂ : 6.8 µg/m³, PM10 : 13.3 µg/m³. Source: LCSQA / Géod'air.